diff --git a/package/shellinabox/Config.in b/package/shellinabox/Config.in
index b349ef34b4..10c492c9d8 100644
--- a/package/shellinabox/Config.in
+++ b/package/shellinabox/Config.in
@@ -1,5 +1,6 @@
 config BR2_PACKAGE_SHELLINABOX
 	bool "shellinabox"
+	depends on BR2_USE_MMU # fork()
 	select BR2_PACKAGE_OPENSSL
 	select BR2_PACKAGE_ZLIB
 	help